That's true. BMI can reveal if people are dangerously underweight, and not eating enough food, leading to excess deaths: http://lefarkins.blogspot.com/2008/08/

That's true. BMI can reveal if people are dangerously underweight, and not eating enough food, leading to excess deaths: http://lefarkins.blogspot.com/2008/08/obesity-apocalypse.html http://lefarkins.blogspot.com/2008/08/obesity-apocalypse.htm... Oddly enough, you'll notice that the "normal" weight is actually more fatal than many "obese" weights. I suspect that there will be a correlation. People on the extremes -- malnourished or morbidly obese -- may have distracting health issues. But in the middle ranges, other health variables would probably give you a better idea.